July 23 9:48 AM PT10:48 AM MT11:48 AM CT12:48 PM ET16:48 GMT0:48 9:48 AM MST11:48 AM EST20:48 UAE18:4812:48 ET11:48 AM CT15:48 - The Celtics agreed to a two-year deal with Zeller, according to reports Saturday.Analysis: The 26-year-old Zeller, the 17th overall pick in the 2012 draft, appeared in 60 games for Boston last season, averaging 6.1 points and 3.0 rebounds. The 7-foot center started only three games after playing in 82 games with 59 starts the previous season when he averaged 10.2 points and 5.7 rebounds. Zeller's deal is expected to include a non-guaranteed second season.